| The karst water system in Yangzhuang basin has complete boundary conditions and complement,diameter and row area,which is a typical karst water system in northern China.In recent years due to the extensive development of industry and agriculture,a large number of exploitation of groundwater resulting in a significant reduction in groundwater resources,water quality deterioration.In order to achieve the groundwater sustainable development and utilization,this paper takes the Yangzhuang Basin as the research object,through the analysis of regional geological and hydrogeological data,using the analytic hierarchy process to establish the groundwater resources and groundwater quality evaluation index system,using GIS to draw the single index partition map.The weight of each index is obtained by using analytic hierarchy process and entropy method.the results of groundwater sustainable development and utilization are obtained through data superposition,and the evaluation results of groundwater sustainable development and utilization are analyzed.The main achievements in this paper are as follows:(1)By analyzing the geological and hydrogeological conditions of Yangzhuang basin.According to the aquifer lithological and water characteristics and then the water rock group in the study area is divided into five types: quaternary loose rock pore water rock group,ordovician carbonate rock fractured karst water rock group,middle-upper cambrian carbonate rock claw rock fractured karst water rock group,lower Cambrian clastic rock clip carbonate rock karst fissure water rock group,metamorphic and intrusive rock fractures water rock group.Finally,determining the relevant resources and the required parameters in the evaluation.(2)Based on the actual situation of the study area,7 evaluation indexes were selected: groundwater minable resources modulus(F1),groundwater natural recharge resource modulus(F2),specific yield(F3),groundwater level drop rate(F4),groundwater exploitation potential modulus(F5),spring water decay rate(F6)and groundwater quality(F7).The weight of each index is obtained by using analytic hierarchy process and entropy method: F1~0.3075,F2~0.1838,F3~0.0727,F4~0.1248,F5~0.1374,F6~0.1091,F7~0.0647.The results show that the natural resources of groundwater resources have the greatest influence on the mining resources of groundwater in the study area.(3)Through the collection of data,field investigation and hydrogeological test to obtain the evaluation index data,using GIS to deal with the parameters of the indicators,to obtain the single index evaluation partition map.(4)The data of each index in the study area were superimposed by GIS software and the comprehensive evaluation results of groundwater sustainable development and utilization were distributed between 0.2165 and 0.8896.The results of the comprehensive evaluation are divided into four levels: 0.8~1,0.6~0.8,0.4~0.6,0.2~0.4,which represent the “Level I-best”," Level II-better","Level III-Medium","Level IV-Poor".Weizhuang-Yangzhuang area still has the ability of continuous development and utilization which the comprehensive evaluation value is between 0.8 and 1.0,and the sustainable development and utilization of groundwater is "Grade I-best",accounting for 6.99% of the area of the study area.The results of the comprehensive evaluation of the north east of the Xinzhao fault block and the west edge of Shanting fault block are between 0.2 and 0.4,and the sustainable utilization of groundwater is poor,accounting for 25.08% of the total area of the study area.The majority of the rest of the regional may be properly exploited which evaluation result is between 0.4 and 0.8.The results show that the Yangzhuang fault block in the study area still has the capability of sustainable development and utilization.The Shanting fault block is the second time,and it may be properly exploited.Xinzhao fault block is poor and not suitable for exploitation. |
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